Community Forums

zipp · 09-25-2014, 05:14 PM

I thought I would flush the grey tank just to make sure it was clean. i had already emptied it a few weeks ago, so I put a bucket under it and about a gallon or 2 of water came out, which i excepted. I left the valve open and turned the bath and kitchen faucet on and no water came out, I ran the water for about 3 or 4 minutes nothing. The valve is working. Do you have to have a ton of water in the tank to get enough force? OH! It's a 2002 Dolphin.

macantic · 09-25-2014, 05:21 PM

if your coach wasn't level it would take more water for it start coming out.

zipp · 09-25-2014, 06:53 PM

It's level, maybe tilted to the drain side. The thing that baffles me is what could possibly clog it up? If thats what it is?

M&EM · 09-25-2014, 07:06 PM

Depending on the dolphin model, the outlet of the grey tank is located close to the center line of the motor home and facing rearward. So any thing but level may add to volume needed reach the drain. There may also be some distortion of the bottom of the tank which can contribute to delay of water reaching the outlet.

Try raising front end.

zipp · 09-25-2014, 07:52 PM

OK, thanks.

docj · 09-25-2014, 08:00 PM

I had a very similar situation with my MH last year. I began to realize that there was something inside the tank acting as a sort of "dam" which prevented liquid from draining until it got to a certain level. Last spring I had the tank cleaned by All Pro Water Flow in Kerrville TX. You can't believe how much calcium-based crud came out of the grey tank. Afterwards the tank drained perfectly. Since your rig of the same vintage as mine I think there is a possibility you may have a similar problem.

zipp · 09-25-2014, 10:41 PM

I wonder how they got the high pressure into the tank,also is there a chemical that would work?

M&EM · 09-25-2014, 10:49 PM

They snake a high pressure head hose in thru the dump valve. It whips about inside.

docj · 09-26-2014, 07:38 AM

Quote:

Originally Posted by M&EM

They snake a high pressure head hose in thru the dump valve. It whips about inside.

They use a small nozzle attached to a hose that is much thinner than the standard sprayer hose. They also have a lot of experience getting that nozzle up into both the gray and back tanks. I don't think chemical would work unless you were prepared to fill your tank with something like CLR and let it soak for weeks. The stuff that came out was basically the same lime buildup that you get in plumbing or boilers. It was really solid and it would take a long, long time to dissolve even if you wanted to fill the tank and try it. IMHO it was worth the $200 I paid for the cleaning.

zipp · 09-30-2014, 09:25 PM

Hey Thanks everyone for the suggestions.I added some water and drove it to the Kentucky Horse farm for the week end, when i took it to the dump station everything worked as it should. By the way something concerned me while there, Acorns falling on the roof! Why would they have trees like that? Should I not be concerned?